It mainly includes general anesthesia, local anesthesia and compound anesthesia. According to the route of entry of anesthetics into the body, there are inhalation anesthesia, intravenous anesthesia and basic anesthesia. Basic anesthesia is the intramuscular injection of certain general anesthetics (commonly used are sodium thiopental and ketamine) to put the patient to sleep and then perform anesthesia surgery. Local anesthesia is the use of local anesthetics such as procaine and lidocaine to cause temporary loss of sensation in a particular part of the body. Commonly used methods include intradural anesthesia (block), nerve block, regional block, local infiltration anesthesia and surface anesthesia. Intraspinal anesthesia is the injection of local anesthetics into the spinal canal through a spinal puncture, where the injection into the subarachnoid space is called subarachnoid block or lumbar anesthesia, and the injection into the epidural space is called epidural block. A nerve block is an injection of local anesthetic into a nerve trunk (plexus) of the body to block nociceptive conduction in the area it innervates. A regional block is a local anesthetic injected around the surgical site to block the nerve endings in the surgical area to achieve the purpose of anesthesia. Local infiltration anesthesia is the injection of local anesthetics directly into the surgical site and evenly distributed to all layers of tissues in the entire surgical area to block pain transmission, and is a common method of anesthesia for minor clinical procedures. Surface anesthesia is the spraying or coating of highly penetrating local anesthetics onto the mucous membrane, conjunctiva and other surfaces to produce anesthetic effects. Compound anesthesia is the simultaneous or sequential application of two or more anesthetics, auxiliary drugs (such as analgesics, tranquilizers, etc.) or anesthesia methods, so that they complement each other to enhance the effect of anesthesia, protect patient safety, and meet the special requirements of certain surgeries. The anesthesia method should be selected according to the condition and surgical needs, indications and contraindications of the anesthesia method.